$(document).ready(function(){
       if (document.getElementById('contactus-drop'))
       {
			$('#contactus-drop').combobox(
			{
			 comboboxContainerClass: "comboboxContainer",
			 comboboxValueContainerClass: "comboboxValueContainer",
			 comboboxValueContentClass: "comboboxValueContent",
			 comboboxDropDownClass: "comboboxDropDownContainer",
			 comboboxDropDownButtonClass: "comboboxDropDownButton",
			 comboboxDropDownItemClass: "comboboxItem",
			 comboboxDropDownItemHoverClass: "comboboxItemHover",
			 comboboxDropDownGroupItemHeaderClass: "comboboxGroupItemHeader",
			 comboboxDropDownGroupItemContainerClass: "comboboxGroupItemContainer",
			 animationType: "slide",
			width: "225px",
			height: "25px"
			}
		    );
		}

});